body{
      font-family: sans-serif;
}
input[type="number"]{
      width:50px;
      text-align: right;
}
input[type="button"]{
  padding: 8px 16px;
  color: white;
  border: none;
  cursor: pointer;
  background-color: #4caf50;
}
input[type="button"]:hover {
  background-color: #27642a;
}
meter{
      width: 100%;
}